54 citations · 187 across the 23 of their papers we have counts for
23 papers
Nonlocal four-fermion theory
F. M. Belchior, J. R. Nascimento, A. Yu. Petrov +1
In this work, we formulate and analyze a nonlocal four-fermion theory in which the usual Dirac operator is deformed by an entire nonlocal form factor. After introducing an auxiliar…
Carroll-Field-Jackiw term in nonlocal Lorentz-violating QED
J. R. Nascimento, A. Yu. Petrov, P. J. Porfirio +1
We investigate the radiative generation of the Carroll--Field--Jackiw (CFJ) term in nonlocal Lorentz- and CPT-violating extensions of quantum electrodynamics. Nonlocality is introd…
Nonrotating and rotating black holes with secondary disformal hair in a ghost-free metric-affine parity-violating scalar-torsion theory
E. Brito, G. Macedo, J. R. Nascimento +2
In this paper, we formulate a ghost-free metric-affine scalar-torsion model in which a pseudoscalar field is coupled to the Nieh--Yan density and derivatively coupled to the Einste…
One-loop contributions in Lorentz-violating scalar QED with nonminimal coupling
F. M. Belchior, J. R. Nascimento, A. Yu. Petrov +1
In the context of pertubative aspects of Lorentz-violating theories, we study the divergent one-loop two-point functions of a Lorentz-violating (LV) extension of scalar QED contain…
Rotating black hole shadows in metric-affine bumblebee gravity
Jose R. Nascimento, Ana R. M. Oliveira, Albert Yu. Petrov +2
In this work, we investigate the structure of black hole shadows in the bumblebee gravity model formulated within the metric-affine framework, which incorporates spontaneous Lorent…
Nonrelativistic effective potential of the bumblebee model
C. Furtado, J. R. Nascimento, A. Yu. Petrov +1
In this paper, we explicitly obtain the nonrelativistic Breit potential in the bumblebee model arising in the weak gravity limit of the metric-affine bumblebee gravity, coupled to…
Four-dimensional supersymmetric massive QED
A. C. Lehum, J. R. Nascimento, A. Yu. Petrov
We study a four-dimensional supersymmetric Proca model with an explicit mass term for a real vector superfield and a generalized transverse kinetic operator. Althoug…
Shadow structure of generalized black-bounce metrics
Jose R. Nascimento, Ana R. M. Oliveira, Albert Yu. Petrov +2
The existence of black hole shadows is one of the most interesting effects of the strong field regime of general relativity (GR). Recent observations by the Event Horizon Telescope…
One-loop Euler-Heisenberg action in Lorentz-violating QED revisited
R. Araújo, T. Mariz, J. R. Nascimento +1
We discuss applications of the proper-time method in a Lorentz-violating extension of QED characterized by the addition of the term proportional to the antisymmetric tensor $H_{μν}…
Mixed gauge-gravity term and proper time
J. R. Nascimento, M. Paganelly, A. Yu. Petrov +1
We consider the four-dimensional action of spinors minimally coupled to a -gauge field in an Riemann-Cartan background. In this theory, we integrate over the spinors and stud…
A novel nonlocal spin-1/2 theory: classical and quantum aspects
J. R. Nascimento, Gonzalo J. Olmo, A. Yu. Petrov +2
We propose a novel nonlocal spin-1/2 theory in which the form factor depends on the Dirac operator rather than on the d'Alembert operator. In this scenario, we explore some classic…
Gravitational lensing by generalized black-bounce space-times
C. Furtado, A. L. A. Moreira, J. R. Nascimento +2
We study gravitational lensing by generalized black-bounce space-times both in regimes of weak and strong field approximations. These metrics interpolate between regular blac…
Perturbative aspects of the supersymmetric three-dimensional massive QED
A. C. Lehum, J. R. Nascimento, A. C. Pina Neto +1
We perform the study of perturbative aspects of a three-dimensional supersymmetric Maxwell-Chern-Simons-Proca theory minimally coupled to scalar superfields. Using the superfield f…
Dual equivalence between the Maxwell-Chern-Simons theory and two self-dual massive models interacting with matter in , superspace
F. S. Gama, J. R. Nascimento, A. Yu. Petrov +1
We investigate the supersymmetric generalization of the dual equivalence between the Maxwell-Chern-Simons model and two massive self-dual models. One of the self-…
Generalized Chern-Pontryagin models
J. R. Nascimento, A. Yu. Petrov, P. J. Porfírio +1
We formulate a new class of modified gravity models, that is, generalized four-dimensional Chern-Pontryagin models, whose action is characterized by an arbitrary function of the Ri…
Derivative four-fermion model, effective action and bumblebee generation
R. Araujo, T. Mariz, J. R. Nascimento +1
In this paper, we study the one-loop effective potential of a derivative four-fermion model. As a result, an exact bumblebee-like potential is radiatively generated. Afterwards, we…
Modified Euler-Heisenberg effective action and Proper-Time Method in Lorentz-Violating Scalar QED
L. C. T. Brito, J. C. C. Felipe, A. C. Lehum +2
Quantum photon effects in vacuum provide an interesting setting to test quantum electrodynamics, serving as a source for predictions about physics beyond the Standard Model. In thi…
One-loop corrections in Maxwell-metric-affine bumblebee gravity
A. C. Lehum, J. R. Nascimento, A. Yu. Petrov +1
In this paper, we consider the coupling of the metric-affine bumblebee gravity to the Abelian gauge field and obtain the effective model corresponding to the weak gravity limit of…
An exact stationary axisymmetric vacuum solution within a metric--affine bumblebee gravity
A. A. Araújo Filho, J. R. Nascimento, A. Yu. Petrov +1
Within the framework of the spontaneous Lorentz symmetry breaking, we consider a metric--affine generalization of the gravitational sector of the Standard--Model Extension (SME), i…
Spontaneous Lorentz symmetry breaking and one-loop effective action in the metric-affine bumblebee gravity
Adrià Delhom, T. Mariz, J. R. Nascimento +3
The metric-affine bumblebee model in the presence of fermionic matter minimally coupled to the connection is studied. We show that the model admits an Einstein frame representation…
Nonlinear -models in the Eddington-inspired Born-Infeld Gravity
J. R. Nascimento, Gonzalo J. Olmo, P. J. Porfírio +2
In this paper we consider two different nonlinear -models minimally coupled to Eddington-inspired Born-Infeld gravity. We show that the resultant geometries represent minimal mo…
Renormalization Group Improvement of the Superpotential for the N=2 Chern-Simons-matter model
A. C. Lehum, J. R. Nascimento, A. Yu. Petrov +1
Within the superfield formalism, we study the renormalization group improvement of the effective superpotential for the Chern-Simons-matter theory, explicitly obtain t…
Gödel and Gödel-type universes in Brans-Dicke theory
J. A. Agudelo, J. R. Nascimento, A. Yu. Petrov +2
In this paper, conditions for existence of Gödel and Gödel-type solutions in Brans-Dicke (BD) scalar-tensor theory and their main features are studied. The consistency of equations…